242520221555 has 16 divisors (see below), whose sum is σ = 298167083424. Its totient is φ = 189255717120.

The previous prime is 242520221551. The next prime is 242520221597. The reversal of 242520221555 is 555122025242.

It is not a de Polignac number, because 242520221555 - 2² = 242520221551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242520221551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1338989 + ... + 1509281.

It is an arithmetic number, because the mean of its divisors is an integer number (18635442714).

Almost surely, 2^242520221555 is an apocalyptic number.

242520221555 is a deficient number, since it is larger than the sum of its proper divisors (55646861869).

242520221555 is a wasteful number, since it uses less digits than its factorization.

242520221555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177286.

The product of its (nonzero) digits is 80000, while the sum is 35.

Adding to 242520221555 its reverse (555122025242), we get a palindrome (797642246797).

The spelling of 242520221555 in words is "two hundred forty-two billion, five hundred twenty million, two hundred twenty-one thousand, five hundred fifty-five".